When I first sent the game to testers, we were having major performance problems. I had tried to do some optimizations, sight unseen, but some testers did some profiling for me and I hadn't made much progress. Eventually I bought a steam myself, and wow it's a really fun device, and it showed me that I had a bunch of post-processing effects on that made basically no visual difference lol. We were struggling to hit 45fps, and now compfortably hit 60fps with time to spare, and GPU utilisation is much better now. And in the 'fast' mode the game can probably run a lot longer on batteries (not sure exactly how much).
Here's the stats for medium quality (77% GPU usage):
Here's the stats for low quality, showing a 38% GPU usage:
(high quality just adds some anti-aliasing right now, no big difference - and my goal is that the game should look nice whatever quality setting you select)
( I'm not sure what to do about the level editor - it's kind of made for mouse-use - I can jimmy in controller support and see how it feels... )
Also today I just finished adding in the last touches of UI support for the steam deck: popping up a virtual keyboard for text-entry in the multiplayer menus. So, fingers crossed we'll get official stamp of steam compatibility at some point, but either way, rest assured : the game will work very well on your very lovely Steam Deck!